Exhibit 24.1

POWER OF ATTORNEY

     Each of the undersigned directors of National Interstate Corporation, an Ohio corporation, which proposes to file with the Securities and Exchange Commission an Annual Report on Form 10-K for the fiscal year ended December 31, 2009 pursuant to the Securities Exchange Act of 1934, as amended, and the rules and regulations promulgated thereunder, hereby constitutes and appoints Julie A. McGraw and Arthur J. Gonzales, their true and lawful attorneys-in-fact, as agents with full power of substitution and resubstitution for him and in his name, place and stead, in any and all capacity, to sign in any and all capacities and file (i) such Annual Report on Form 10-K with all exhibits thereto and other documents in connection therewith and (ii) any and all amendments and supplements thereto, granting unto such attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully and to all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

     This Power of Attorney has been signed in the respective capacities and on the respective dates indicated below.

Signature		Title		Date
/s/ Alan R. Spachman   Alan R. Spachman		Chairman of the Board		03/05/10
/s/ Joseph E. Consolino   Joseph E. Consolino		Director		03/05/10
/s/ Theodore H. Elliott, Jr.   Theodore H. Elliott, Jr.		Director		03/05/10
/s/ Gary J. Gruber   Gary J. Gruber		Director		03/05/10
/s/ Keith A. Jensen   Keith A. Jensen		Director		03/05/10
/s/ James C. Kennedy   James C. Kennedy		Director		03/05/10
/s/ Donald D. Larson   Donald D. Larson		Director		03/05/10
/s/ David W. Michelson   David W. Michelson		Director, Chief Executive Officer, President		03/05/10